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R31538 Cobalt vs. ASTM A229 Spring Steel

R31538 cobalt belongs to the cobalt alloys classification, while ASTM A229 spring steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is ASTM A229 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
14
Fatigue Strength, MPa 310 to 480
710 to 790
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
1690 to 1890
Tensile Strength: Yield (Proof), MPa 580 to 930
1100 to 1230

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
50
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.4
Embodied Energy, MJ/kg 110
19
Embodied Water, L/kg 530
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
3260 to 4080
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
60 to 67
Strength to Weight: Bending, points 27 to 32
40 to 43
Thermal Diffusivity, mm2/s 3.5
14
Thermal Shock Resistance, points 25 to 33
54 to 60

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.55 to 0.85
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
97.5 to 99
Manganese (Mn), % 0 to 1.0
0.3 to 1.2
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.050

Comparable Variants